Joint CHP-Wind Heating Dispatch for Peak-Valley Load Balancing
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Solution Overview
Problem
The integration of wind power into the grid faces challenges due to its anti-peaking characteristic, leading to increased differences between peak and valley power demands, which complicates grid scheduling, voltage control, and results in wind abandonment, especially during off-peak hours when there is abundant wind energy but no demand.
Innovation Solution
A joint heat supply system combining a coal-fired condensing-extraction combined heat and power unit with wind power generation, utilizing an air conditioner heat pump and water-heating radiator, controlled by a comprehensive scheduling device that adjusts power and heat output based on predicted energy demand and consumption patterns, to ensure smooth wind power output and efficient energy utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If wind power is integrated into the grid, then clean energy utilization is improved, but grid scheduling complexity increases due to anti-peaking characteristics
Solution Approach 1:
The patent combines wind power generation with coal-fired combined heat and power units to form a joint heat supply system. This merging allows the system to simultaneously utilize wind energy and traditional thermal power, reducing wind abandonment while maintaining stable heat supply capability during peak and valley periods
Solution Approach 2:
The system performs preliminary heating of water in the heat supply network during off-peak hours when wind power is abundant. By pre-heating the water in the pipeline, the system stores thermal energy that can be utilized during peak periods, thereby reducing the need for thermal power generation during peak demand and improving overall wind power utilization
2Loss of energy
If water flow for heating output is reduced in the coal-fired unit, then wind power utilization is improved, but heat supply capability deteriorates
Solution Approach 1:
The system pre-heats water in the heat supply network during off-peak hours when wind power is abundant and thermal demand is low. This preliminary heating action stores thermal energy in the pipeline, which can be drawn upon during peak periods to maintain heat supply capability even when thermal power generation is reduced
Solution Approach 2:
The heat supply network water acts as an intermediary thermal storage medium. By heating this water during off-peak hours and utilizing it during peak hours, the system decouples the timing of heat production and heat consumption, allowing wind power to be utilized more effectively without compromising peak heat supply reliability
3Productivity
If comprehensive scheduling control is implemented, then energy efficiency is improved, but system control complexity increases
Solution Approach 1:
The system implements comprehensive scheduling control that continuously monitors wind power output, thermal load demand, and heat supply network temperature. Based on this feedback, the control system dynamically adjusts the operation of wind turbines and coal-fired combined heat and power units to optimize energy efficiency while maintaining heat supply reliability
Solution Approach 2:
The coal-fired combined heat and power units serve multiple functions: they can operate in heat-only mode during peak thermal demand, in combined heat and power mode during normal operation, and can be reduced or shut down during peak wind power generation. This multi-functionality allows a single system to address multiple operational requirements without requiring separate dedicated systems
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This system achieves smooth wind power output by reducing water flow for heating output in the coal-fired unit, compensating with power-consuming heat pumps, and adjusts power generation to meet demand, effectively utilizing wind energy and reducing heat supply delays, thereby improving energy efficiency and user satisfaction.
Implementation Method 1
the insufficient heat supply for the user due to the reduced hot water flow is compensated by the heat supply from the air conditioner heat pump consuming electricity
Data Source
AI summary
A cogeneration unit and wind power joint heating system and a scheduling method therefor. The joint heating system comprises a coal-fired steam-extraction condensing-steam cogeneration unit (A), a wind turbine generator unit (B), an air conditioner heat pump (108) parallel-connected to the coal-fired steam-extraction condensing-steam cogeneration unit (A) and to the wind turbine generator unit (B) via a power cable network (113), and a hot water heating radiator (110) connected to the coal-fired steam-extraction condensing-steam cogeneration unit (A) via a heating pipe network (114). The joint heating system also comprises an integrated scheduling control device (115), a first remote centralized controller (1121), a second remote centralized controller (1122), and a third remote centralized controller (1123). Heating is provided to a user by the hot water heating radiator (110) and the air conditioner heat pump (108); while electricity is provided jointly by the coal-fired steam-extraction condensing-steam cogeneration unit (A) and the wind turbine generator unit (B). The scheduling method comprises: after detecting over a period of time the state of power supply and the state of power consumption of the user via the integrated scheduling control device (115), making a prediction for an upcoming period of time, and then scheduling on this basis. Under the premise of ensuring electricity supply and heat supply, the scheduling method reduces hot water flow outputted for heating, and compensates with electricity heating.